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Vulnerabilities

Vulnerability · CVE-2025-3677

A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36.

Published Apr 16, 2025 · catalog updated Apr 21, 2025 · A vulnerability classified as

Check if you run it

No confirmed exploitation is on record for CVE-2025-3677. EPSS is 0.21%. Act only if a listed version of A vulnerability classified as is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A vulnerability classified as).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Vendor / distro source
Affected products
vendor lm-sys fastchat 0.2.15

A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor lm-sys fastchat 0.2.150.2.15

How to fix CVE-2025-3677

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-3677. EPSS is 0.21%. Act only if a listed version of A vulnerability classified as is installed.

Which versions are affected?

Compare what you have installed with lm-sys fastchat 0.2.15 0.2.15. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 16, 2025 · EUVD

    Detected

    A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.

  2. Apr 21, 2025 · EUVD

    Updated

    A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.

Sources

  • CVE.orgVulnerability recordCVE-2025-3677

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-3677

    30-day exploitation probability 0.2%

    first.org
  • EUVDVulnerability recordEUVD-2025-11794

    A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached local

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.